100% Leather Black One Size 12" Length, 11.25" Height, 2.5" Depth This is an authentic ALEXANDER WANG Lambskin Marti Backpack Bag Washed Black Rhodium Hardware. This stylish backpack is made of supple black lambskin leather. The shoulder bag features detachable leather shoulder straps with polished silver clasps, two external pockets with zippers on the side, a cross over flap with straps and an external center expansion zipper. This opens to a spacious black nylon fabric interior with a belt cinch strap closure and zipper pocket